Hello Hayden,
The way it works is - you purchase all sized filters for your accounts, keeping control of them. You set up a program to go by and pick-up the dirties and replace them with your cleans. Carry the dirties back to your shop where you have them dipped and cleaned and stored. You then go back out in a week, 2 weeks, 3
weeks etc, to exchange the clean for dirty. The average service charge is $1.50 - $3.00 per filter. It's kinda like a hotel linen service and you better have a contract for your own good. The initial overhead is high since you have to buy and store the filters-you are really maintaining your customers system to keep out the competition. The customers generally couldn't care less- it's just one less thing for them to not put through the dishwasher.
Jones